Summer frontal precipitation in the United States area of Daf climate

The study is designed to indicate the relative importance of frontal precipitation in the Daf (humid continental, warm summer phase) climate of the United States during the summer months. Ten stations were selected from seven states within the area. Daily and hourly precipitation for these stations were considered in conjunction with Daily Weather Maps. Each occurrence of precipitation was classified according to time of occurrence, its relation to areas of continuous precipitation, and relative positions of frontal systems. Two basic categories of classification, frontal and nonfrontal, were used. Precipitation associated with fronts and cyclones shown on the surface synoptic chart was classified as frontal. Five years were considered, 1952 through 1956, and attention was focused on the warm season, June through September. Analysis of the precipitation occurrences included in this study suggests that precipitation associated with fronts is dominant during the warm season in this area.